Laptop battery dies...?!

[Giganizer300PRO]

So I have a friend's laptop, a Toshiba Satellite C855-1PP here and...

Just now, a message apeared: there's a little red cross on the icon and the message says: "There is a problem with your battery, so your computer might shut down suddenly." "Consider replacing your battery". It has also discharged for almost 10% in 5 minutes now. This only occurred now, in the morning (about 5-6 hours ago) it was working just fine. The laptop is almost 2 years old (not completely sure).

Could this be it? Is the battery dying?!                 

[ERSCreeper]

So I have a friend's laptop, a Toshiba Satellite C855-1PP here and...

Just now, a message apeared: there's a little red cross on the icon and the message says: "There is a problem with your battery, so your computer might shut down suddenly." "Consider replacing your battery". It has also discharged for almost 10% in 5 minutes now. This only occurred now, in the morning (about 5-6 hours ago) it was working just fine. The laptop is almost 2 years old (not completely sure).

Could this be it? Is the battery dying?!                 

Chances are that the battery is depleted and can't hold a charge anymore. It will hold for a short amount of time but not a full charge. Consider a battery replacement 

[cesrai]

Battery gauge reset may help.

[cesrai]

Chances are that the battery is depleted and can't hold a charge anymore. It will hold for a short amount of time but not a full charge. Consider a battery replacement 

Will a battery gauge help??

[ERSCreeper]

Will a battery gauge help??

Worth a try but the chances are that the battery has degraded enough not to hold a charge to much time.

[Giganizer300PRO]

So basically it's dead. 

Does anyone know a best way to get a new one / fix this problem?